drivers/usb/dwc3/dwc3-generic.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic DWC3 Glue layer
   4  *
   5  * Copyright (C) 2016 - 2018 Xilinx, Inc.
   6  *
   7  * Based on dwc3-omap.c.
   8  */
   9
  10 #include <common.h>
  11 #include <asm-generic/io.h>
  12 #include <dm.h>
  13 #include <dm/device-internal.h>
  14 #include <dm/lists.h>
  15 #include <dwc3-uboot.h>
  16 #include <linux/usb/ch9.h>
  17 #include <linux/usb/gadget.h>
  18 #include <malloc.h>
  19 #include <usb.h>
  20 #include "core.h"
  21 #include "gadget.h"
  22 #include <reset.h>
  23 #include <clk.h>
  24
  25 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  26 struct dwc3_generic_peripheral {
  27         struct dwc3 dwc3;
  28         struct phy *phys;
  29         int num_phys;
  30         fdt_addr_t base;
  31 };
  32
  33 int dm_usb_gadget_handle_interrupts(struct udevice *dev)
  34 {
  35         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  36         struct dwc3 *dwc3 = &priv->dwc3;
  37
  38         dwc3_gadget_uboot_handle_interrupt(dwc3);
  39
  40         return 0;
  41 }
  42
  43 static int dwc3_generic_peripheral_probe(struct udevice *dev)
  44 {
  45         int rc;
  46         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  47         struct dwc3 *dwc3 = &priv->dwc3;
  48
  49         rc = dwc3_setup_phy(dev, &priv->phys, &priv->num_phys);
  50         if (rc)
  51                 return rc;
  52
  53         dwc3->regs = map_physmem(priv->base, DWC3_OTG_REGS_END, MAP_NOCACHE);
  54         dwc3->regs += DWC3_GLOBALS_REGS_START;
  55         dwc3->dev = dev;
  56
  57         rc =  dwc3_init(dwc3);
  58         if (rc) {
  59                 unmap_physmem(dwc3->regs, MAP_NOCACHE);
  60                 return rc;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int dwc3_generic_peripheral_remove(struct udevice *dev)
  67 {
  68         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  69         struct dwc3 *dwc3 = &priv->dwc3;
  70
  71         dwc3_remove(dwc3);
  72         dwc3_shutdown_phy(dev, priv->phys, priv->num_phys);
  73         unmap_physmem(dwc3->regs, MAP_NOCACHE);
  74
  75         return 0;
  76 }
  77
  78 static int dwc3_generic_peripheral_ofdata_to_platdata(struct udevice *dev)
  79 {
  80         struct dwc3_generic_peripheral *priv = dev_get_priv(dev);
  81         struct dwc3 *dwc3 = &priv->dwc3;
  82         int node = dev_of_offset(dev);
  83
  84         priv->base = devfdt_get_addr(dev);
  85
  86         dwc3->maximum_speed = usb_get_maximum_speed(node);
  87         if (dwc3->maximum_speed == USB_SPEED_UNKNOWN) {
  88                 pr_err("Invalid usb maximum speed\n");
  89                 return -ENODEV;
  90         }
  91
  92         dwc3->dr_mode = usb_get_dr_mode(node);
  93         if (dwc3->dr_mode == USB_DR_MODE_UNKNOWN) {
  94                 pr_err("Invalid usb mode setup\n");
  95                 return -ENODEV;
  96         }
  97
  98         return 0;
  99 }
 100
 101 U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 102         .name   = "dwc3-generic-peripheral",
 103         .id     = UCLASS_USB_GADGET_GENERIC,
 104         .ofdata_to_platdata = dwc3_generic_peripheral_ofdata_to_platdata,
 105         .probe = dwc3_generic_peripheral_probe,
 106         .remove = dwc3_generic_peripheral_remove,
 107         .priv_auto_alloc_size = sizeof(struct dwc3_generic_peripheral),
 108 };
 109 #endif
 110
 111 struct dwc3_glue_data {
 112         struct clk_bulk         clks;
 113         struct reset_ctl_bulk   resets;
 114         fdt_addr_t regs;
 115 };
 116
 117 struct dwc3_glue_ops {
 118         void (*select_dr_mode)(struct udevice *dev, int index,
 119                                enum usb_dr_mode mode);
 120 };
 121
 122 void dwc3_ti_select_dr_mode(struct udevice *dev, int index,
 123                             enum usb_dr_mode mode)
 124 {
 125 #define USBOTGSS_UTMI_OTG_STATUS                0x0084
 126 #define USBOTGSS_UTMI_OTG_OFFSET                0x0480
 127
 128 /* UTMI_OTG_STATUS REGISTER */
 129 #define USBOTGSS_UTMI_OTG_STATUS_SW_MODE        BIT(31)
 130 #define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT   BIT(9)
 131 #define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE BIT(8)
 132 #define USBOTGSS_UTMI_OTG_STATUS_IDDIG          BIT(4)
 133 #define USBOTGSS_UTMI_OTG_STATUS_SESSEND        BIT(3)
 134 #define USBOTGSS_UTMI_OTG_STATUS_SESSVALID      BIT(2)
 135 #define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID      BIT(1)
 136 enum dwc3_omap_utmi_mode {
 137         DWC3_OMAP_UTMI_MODE_UNKNOWN = 0,
 138         DWC3_OMAP_UTMI_MODE_HW,
 139         DWC3_OMAP_UTMI_MODE_SW,
 140 };
 141
 142         u32 use_id_pin;
 143         u32 host_mode;
 144         u32 reg;
 145         u32 utmi_mode;
 146         u32 utmi_status_offset = USBOTGSS_UTMI_OTG_STATUS;
 147
 148         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 149         void *base = map_physmem(glue->regs, 0x10000, MAP_NOCACHE);
 150
 151         if (device_is_compatible(dev, "ti,am437x-dwc3"))
 152                 utmi_status_offset += USBOTGSS_UTMI_OTG_OFFSET;
 153
 154         utmi_mode = dev_read_u32_default(dev, "utmi-mode",
 155                                          DWC3_OMAP_UTMI_MODE_UNKNOWN);
 156         if (utmi_mode != DWC3_OMAP_UTMI_MODE_HW) {
 157                 debug("%s: OTG is not supported. defaulting to PERIPHERAL\n",
 158                       dev->name);
 159                 mode = USB_DR_MODE_PERIPHERAL;
 160         }
 161
 162         switch (mode)  {
 163         case USB_DR_MODE_PERIPHERAL:
 164                 use_id_pin = 0;
 165                 host_mode = 0;
 166                 break;
 167         case USB_DR_MODE_HOST:
 168                 use_id_pin = 0;
 169                 host_mode = 1;
 170                 break;
 171         case USB_DR_MODE_OTG:
 172         default:
 173                 use_id_pin = 1;
 174                 host_mode = 0;
 175                 break;
 176         }
 177
 178         reg = readl(base + utmi_status_offset);
 179
 180         reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SW_MODE);
 181         if (!use_id_pin)
 182                 reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 183
 184         writel(reg, base + utmi_status_offset);
 185
 186         reg &= ~(USBOTGSS_UTMI_OTG_STATUS_SESSEND |
 187                 USBOTGSS_UTMI_OTG_STATUS_VBUSVALID |
 188                 USBOTGSS_UTMI_OTG_STATUS_IDDIG);
 189
 190         reg |= USBOTGSS_UTMI_OTG_STATUS_SESSVALID |
 191                 USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT;
 192
 193         if (!host_mode)
 194                 reg |= USBOTGSS_UTMI_OTG_STATUS_IDDIG |
 195                         USBOTGSS_UTMI_OTG_STATUS_VBUSVALID;
 196
 197         writel(reg, base + utmi_status_offset);
 198
 199         unmap_physmem(base, MAP_NOCACHE);
 200 }
 201
 202 struct dwc3_glue_ops ti_ops = {
 203         .select_dr_mode = dwc3_ti_select_dr_mode,
 204 };
 205
 206 static int dwc3_glue_bind(struct udevice *parent)
 207 {
 208         const void *fdt = gd->fdt_blob;
 209         int node;
 210         int ret;
 211
 212         for (node = fdt_first_subnode(fdt, dev_of_offset(parent)); node > 0;
 213              node = fdt_next_subnode(fdt, node)) {
 214                 const char *name = fdt_get_name(fdt, node, NULL);
 215                 enum usb_dr_mode dr_mode;
 216                 struct udevice *dev;
 217                 const char *driver = NULL;
 218
 219                 debug("%s: subnode name: %s\n", __func__, name);
 220
 221                 dr_mode = usb_get_dr_mode(node);
 222
 223                 switch (dr_mode) {
 224                 case USB_DR_MODE_PERIPHERAL:
 225                 case USB_DR_MODE_OTG:
 226 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
 227                         debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 228                         driver = "dwc3-generic-peripheral";
 229 #endif
 230                         break;
 231                 case USB_DR_MODE_HOST:
 232                         debug("%s: dr_mode: HOST\n", __func__);
 233                         driver = "xhci-dwc3";
 234                         break;
 235                 default:
 236                         debug("%s: unsupported dr_mode\n", __func__);
 237                         return -ENODEV;
 238                 };
 239
 240                 if (!driver)
 241                         continue;
 242
 243                 ret = device_bind_driver_to_node(parent, driver, name,
 244                                                  offset_to_ofnode(node), &dev);
 245                 if (ret) {
 246                         debug("%s: not able to bind usb device mode\n",
 247                               __func__);
 248                         return ret;
 249                 }
 250         }
 251
 252         return 0;
 253 }
 254
 255 static int dwc3_glue_reset_init(struct udevice *dev,
 256                                 struct dwc3_glue_data *glue)
 257 {
 258         int ret;
 259
 260         ret = reset_get_bulk(dev, &glue->resets);
 261         if (ret == -ENOTSUPP)
 262                 return 0;
 263         else if (ret)
 264                 return ret;
 265
 266         ret = reset_deassert_bulk(&glue->resets);
 267         if (ret) {
 268                 reset_release_bulk(&glue->resets);
 269                 return ret;
 270         }
 271
 272         return 0;
 273 }
 274
 275 static int dwc3_glue_clk_init(struct udevice *dev,
 276                               struct dwc3_glue_data *glue)
 277 {
 278         int ret;
 279
 280         ret = clk_get_bulk(dev, &glue->clks);
 281         if (ret == -ENOSYS)
 282                 return 0;
 283         if (ret)
 284                 return ret;
 285
 286 #if CONFIG_IS_ENABLED(CLK)
 287         ret = clk_enable_bulk(&glue->clks);
 288         if (ret) {
 289                 clk_release_bulk(&glue->clks);
 290                 return ret;
 291         }
 292 #endif
 293
 294         return 0;
 295 }
 296
 297 static int dwc3_glue_probe(struct udevice *dev)
 298 {
 299         struct dwc3_glue_ops *ops = (struct dwc3_glue_ops *)dev_get_driver_data(dev);
 300         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 301         struct udevice *child = NULL;
 302         int index = 0;
 303         int ret;
 304
 305         glue->regs = dev_read_addr(dev);
 306
 307         ret = dwc3_glue_clk_init(dev, glue);
 308         if (ret)
 309                 return ret;
 310
 311         ret = dwc3_glue_reset_init(dev, glue);
 312         if (ret)
 313                 return ret;
 314
 315         ret = device_find_first_child(dev, &child);
 316         if (ret)
 317                 return ret;
 318
 319         while (child) {
 320                 enum usb_dr_mode dr_mode;
 321
 322                 dr_mode = usb_get_dr_mode(dev_of_offset(child));
 323                 device_find_next_child(&child);
 324                 if (ops && ops->select_dr_mode)
 325                         ops->select_dr_mode(dev, index, dr_mode);
 326                 index++;
 327         }
 328
 329         return 0;
 330 }
 331
 332 static int dwc3_glue_remove(struct udevice *dev)
 333 {
 334         struct dwc3_glue_data *glue = dev_get_platdata(dev);
 335
 336         reset_release_bulk(&glue->resets);
 337
 338         clk_release_bulk(&glue->clks);
 339
 340         return dm_scan_fdt_dev(dev);
 341 }
 342
 343 static const struct udevice_id dwc3_glue_ids[] = {
 344         { .compatible = "xlnx,zynqmp-dwc3" },
 345         { .compatible = "ti,keystone-dwc3"},
 346         { .compatible = "ti,dwc3", .data = (ulong)&ti_ops },
 347         { }
 348 };
 349
 350 U_BOOT_DRIVER(dwc3_generic_wrapper) = {
 351         .name   = "dwc3-generic-wrapper",
 352         .id     = UCLASS_MISC,
 353         .of_match = dwc3_glue_ids,
 354         .bind = dwc3_glue_bind,
 355         .probe = dwc3_glue_probe,
 356         .remove = dwc3_glue_remove,
 357         .platdata_auto_alloc_size = sizeof(struct dwc3_glue_data),
 358
 359 };